Samsung Galaxy S III was found to be using a different HDTV MHL/HDMI connector/adapter and it looks like that the Korean company made it intentional. This was found out and tested by a retailer called Clove Technology from the U.K. from his recent blog report. The report shows wherein if you have already purchased an adapter for your HDTV while using Samsung Galaxy Nexus or Samsung Galaxy S II, that cable you are now using won’t work on Samsung Galaxy S III. This is because that the connector is using a different pin configuration and connection.
Obviously, an adapter with a different pin configuration and connection will not be backward compatible – well this is what I believe with my Electronics experience. Of course, I may be wrong about this but there are no reports yet that the new adapter is indeed compatible with other Samsung smartphones.
Here’s Clove Technology’s unboxing of the Samsung Galaxy S3 MHL/HDMI adapter required to use the TV out facility with a HD monitor without an MHL connection.